The diameter is a special type of chord that goes through the center point of the circle. Sort of like a piece of pizza or pie.Ĭhord - A chord is a line segment that joins two points on the circle. Other Circle Geometry terms Sector - A sector is a section of the circle made by two different radii. Where c = circumference, d = diameter, and r = radius. It's close enough.īack to circumference There are a few handy formulas we will use: CircleGeometry(radius : Float, segments : Integer, thetaStart : Float, thetaLength : Float). The decimals actually go on for a long time (forever), but we will round it off to 3.14. CircleGeometry is a simple shape of Euclidean geometry. We won't go into the details right now, but let's just agree to use it and that it works for now. It stands for a number that we use with circles. We use the following formula to figure the circumference: So the diameter is two times the radius and the radius is one half of the diameter.Ĭircumference - The circumference is the distance around the circle.
This gives you our first math equation for the circle:
This is the same distance R we used to make the circle in our definition.ĭiameter - The diameter is a straight line that goes across the circle and through the center. Terms used in circle geometry Radius- The radius is the distance from the center point to the edge of the circle.
#Radius of a circle geometry movie
Watch as we add in equal distanced points in the movie below:
Now pick all the other points on the screen that are the exact same distance R away from point P. Let's pick a point on a flat surface, like this screen, for instance. Okay, so let's start out with the "given point". We can learn a lot about the real world and how it works by understanding circles.įirst, what is the official definition of a circle?Ī circle is a shape that is made up of all the points on a plane (a flat surface) that are the same distance from a given point. There are circles all around us in the real world. A circle is an important shape in geometry.
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